FEASIBILITY STUDY OF HEAT EXTRACTION FROM A CLOSED-LOOP FRACTURED GEOTHERMAL RESERVOIR; A MULTIPHYSICS PROBLEM

2016 ◽  
Author(s):  
Milad Ahmadi ◽  
◽  
Arash Dahi Taleghani
Keyword(s):  
Feasibility Study ◽  
Closed Loop ◽  
Geothermal Reservoir ◽  
Heat Extraction

scholarly journals An Approximate Solution for Predicting the Heat Extraction and Preventing Heat Loss from a Closed-Loop Geothermal Reservoir

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Bisheng Wu ◽  
Tianshou Ma ◽  
Guanhong Feng ◽  
Zuorong Chen ◽  
Xi Zhang
Keyword(s):  
Closed Loop ◽  
Dominant Role ◽  
Approximate Solutions ◽  
Injection Rate ◽  
Geothermal Reservoir ◽  
Heat Extraction ◽  
Geothermal System ◽  
Fluid Viscosity ◽  
Vertical Wells ◽  
Output Performance

Approximate solutions are found for a mathematical model developed to predict the heat extraction from a closed-loop geothermal system which consists of two vertical wells (one for injection and the other for production) and one horizontal well which connects the two vertical wells. Based on the feature of slow heat conduction in rock formation, the fluid flow in the well is divided into three stages, that is, in the injection, horizontal, and production wells. The output temperature of each stage is regarded as the input of the next stage. The results from the present model are compared with those obtained from numerical simulator TOUGH2 and show first-order agreement with a temperature difference less than 4°C for the case where the fluid circulated for 2.74 years. In the end, a parametric study shows that (1) the injection rate plays dominant role in affecting the output performance, (2) higher injection temperature produces larger output temperature but decreases the total heat extracted given a specific time, (3) the output performance of geothermal reservoir is insensitive to fluid viscosity, and (4) there exists a critical point that indicates if the fluid releases heat into or absorbs heat from the surrounding formation.

Feasibility Study of Upgrading Primary Feeders From Radial and Open-Loop to Normally Closed-Loop Arrangement

2004 ◽  
Vol 19 (3) ◽  
pp. 1308-1316 ◽  
Author(s):  
T.-H. Chen ◽  
W.-T. Huang ◽  
J.-C. Gu ◽  
G.-C. Pu ◽  
Y.-F. Hsu ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Closed Loop ◽  
Open Loop

An Improved Closed-Loop Heat Extraction Method From Geothermal Resources

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Arash Dahi Taleghani
Keyword(s):  
Contact Area ◽  
Geothermal Energy ◽  
Closed Loop ◽  
Produced Water ◽  
Heat Extraction ◽  
Working Fluid ◽  
Induced Earthquakes ◽  
Geothermal Resources ◽  
Major Mechanism ◽  
Pressure Changes

Disposal of produced water and induced earthquakes are two major issues that have endangered development of the geothermal energy as a renewable source of energy. To avoid these problems, circulation of a low-boiling working fluid in a closed loop has been proposed; however; since the major mechanism in this method for heat extraction is conduction rather than convection and additionally the heat conduction is limited to the wellbore surface. To overcome this shortcoming, the formation can be fractured with high conductivity material (for instance, silicon carbide ceramic proppants or cements with silane and silica fume as admixtures) to artificially increase the contact area between the “working fluid” and the reservoir. Our calculations show that fracturing increases the contact area by thousand times, additionally, the fracturing materials reinforce and stressed the formation, which reduce the risk of seismic activity due to temperature or pressure changes of the system during the production.

Feasibility Study of a Hybrid Closed-Loop System with Automated Insulin Correction Boluses

2020 ◽  
Author(s):  
Revital Nimri ◽  
Benyamin Grosman ◽  
Anirban Roy ◽  
Judith Nir ◽  
Naama Fisch Shvalb ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Closed Loop ◽  
Loop System ◽  
Closed Loop System

scholarly journals Numerical evaluation of building heating potential from a co-axial closed-loop geothermal system using wellbore–reservoir coupling numerical model

2019 ◽  
Vol 38 (3) ◽  
pp. 733-754 ◽  
Author(s):  
Tianfu Xu ◽  
Zixu Hu ◽  
Bo Feng ◽  
Guanhong Feng ◽  
Fengyu Li ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Closed Loop ◽  
Heating System ◽  
Coupling Model ◽  
Production Performance ◽  
Heat Extraction ◽  
Geothermal System ◽  
Renewable Energy Resources ◽  
Practical Engineering ◽  
System Maintenance

Geothermal energy is one of the most potential renewable energy resources. How to efficiently extract and utilize geothermal energy has been a worldwide hot topic. Co-axial closed-loop geothermal system is a novel method using a continuously closed wellbore without water exchange with. It is more suitable for reservoirs with medium or low temperature and permeability because many problems could be avoided such as lack of in situ groundwater or low infectivity of the reservoir. Many companies and research institutes have applied closed-loop geothermal system in building heating engineering and some fine results have been gained. However, in practical engineering construction, the area of a closed-loop geothermal system heating system is a very important parameter. It directly determines the cost accounting and initial design of the project. Accurate and reliable estimation of heating capacity becomes very important. In this study, a wellbore–reservoir coupling model is established, which is calibrated using measured data from a short-term field trial operation. We have carried out mixed convective–conductive fluid-flow modeling using a wellbore flow model for TOUGH2 called T2Well to investigate the heat extraction performance of closed-loop geothermal system. The system evolution and the effect of flow rate and injection temperature on heat production performance are discussed. The result shows that the intermittent production cycles are more beneficial for heat extraction and system maintenance, and the temperature recovery between two heating seasons is enough to maintain system heating. And we can calculate that a geothermal well can ensure heating of buildings of 10,000–20,000 m2 and the heating area of intermittent operation is 4000 m2 more than continuous operation. Besides, the sensitivity analysis of parameters is also carried out.

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